Electric massager



United States Patent [72] Inventors Hiroyuki M;

[50] Field 128/32, 48, Shuhei Ochi and-Kenzo Shirakawa, 49, S9, 44, 24.2, 61 Kadomashi, Japan [21] Appl. No. 699,554

[56] References Cited UNITED STATES PATENTS [22] Filed 009 9 645%4 888 00 ZZZWZ ill 1 2 l m m r u n e m m k m m m m m u n n u p n "n pd e .i m m w mm TC n m m e n l lPNBBWm h 35 23 c 00235 S 99999 w lllll 5 5 1.

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improved electric massager, which comprises a case, an electric motor contained in said case and a means for giving an oscillating motion from the torque of said motor to at least one operating lever pivoted to a gear box fixed within said case.

ABSTRACT: An

128/49 A6lh7/00 [54] ELECTRIC MASSAGER 4 Claims, 8 Drawing Figs.

51 Int Cl Patented ShUhQL DQq By Kenzo Shirakawa Patented Oct. 27; 1970 3,536,064

Sheet '3 of4 V I VENTORS Hlro Ukb uroda 511115 21, Och

BY Kenzo 5hl'rakaww At qrnegs Patented Oct. 27, 1970 3,536,064

Sheet i of4 Fig. 7

Fig. 6 B

Hiroyukc Kuroda. BY Shuhei. Ochi.

Kenzo .Shlrakuwm 134W Wk rww AUuor-n as INVENTORS v ELECTRIC MASSAGER This invention relates to electric massagers.

There are already generally known electric massagers of a type in which a vibrating piece is attracted and vibrated by an electromagnet and of a rotary type in which an eccentric weight is rotated by a rotary shaft of an electric motor. These known conventional electric massagers have drawbacks that, as attachments are vibrated at a frequency of 7200 to 8000 cycles/minute and a massage is carried out by the vibration of attachment is rotatably pivoted to one of the operating levers,

through a spring so that a painless effective massage may be carried out on muscles.

Another object of the present invention is to provide a massager which is long in the lateral direction and easy to hold.

A further object of the present invention is to provide a massager in which the attachment is easy to mount and dismount and to clean and the cushion is easy to replace.

A still'further object of the present invention is to provide a massager subject to little wear and noise.

Other objects and advantages of the present invention will be made clear by the perusal of the following detailed explanation with reference to the drawings.

FIG. 1 is a partly sectioned side view of a massager of the present invention with the covers centrally sectioned.

FIG. 2 is a bottom view of the same with the lower cover and the attachments removed.

FIG. 3 is a disassembled perspective view.

FIG. 4 is a partly sectioned side view from the other side showing a gear mechanism and a connecting mechanism for a gear box and an electric motor.

FIG. 5 is a sectioned side view showing the relation between an eccentric cam and a slider.

FIG. 6 shows a coiled spring as fitted, (A) being a back view and (B) being a side view.

FIG. 7 is a sectioned view of an attachment.

The present invention shall be explained with reference to a preferred embodiment. But it should be understood that the invention is not to be limited to the specific embodiment .6 operating lever 30 formed at the other end.

shown here but is to include arrangements equivalent to various modifications to be included in the claims and its spirit.

In the drawings, 1 and 2 are cases and bolts 6, 7 and 8 are inserted respectively into holes 3, 4 and 5 made in the case 2 and are screwed respectively into threaded fixing holes 9, l0 and 11 formed in the case 1 so that the cases 1 and 2 may be integrally combined with each other. Twelve is a cord, 13 is a bushing, 14 is a rectifier part, 15 and 16 are noise preventing coils, 17 is a switch, 18 is a motor part, 19 is a fan and 20 is a gear box. Said gear box 20 and motor part 18 are integrally combined with each other. Twenty-one, 22 and 23 are fixing holes for said gear box 20. Twenty-four, 25 and 26 are fixing threaded holes made in the case 1. Bolts 27, 28 and 29 are screwed respectively into the fixing holes 21, 22 and 23 and the fixing threaded holes 24, 25 and 26 so that the gear box 20 may be secured within the case 1.

Thirty is a first operating lever pivoted to the gear box 20 with a shaft 31 and having a gear part 32 formed at one end. Thirty-three is a second operating lever pivoted to the first operating lever 30 with a shaft 34, projected out of the instrument at one end through an opening 35 in the case 2 and engaged in the bent part at the tip of an arm 36 provided in the middle with the lower side of the first operating lever 30. Thirty-seven is a coiled spring engaged at one end with the right side of the first operating lever 30 and at the other end with Forty-two and 43 are attachments. The second operating lever 33 and third operating lever 38 are insertedat' the tips respectively into openings 44 and 45 made in the peripheral barrel parts of the attachments 42 and 43 and bolts 46 and 47 are inserted respectively into fixing holes 48 and 49 in theattachments 42 and 43 and into holes 50 and 51 at the tips-bf said operating levers 33 and 38. so that the attachments may be fixed to the respective operating levers.

Fifty-two is an opening made in the first operating lever 30. Fifty-three and 54 are guides made of plastic and engaged with the respective sides of said opening 52. A slider 55 is set with a common shaft 61. Sixty-two is a gear meshing with said gear 60 and fixed to a rotary shaft 63. Sixty-four is an eccentn'c cam formed at the tip of said rotary shaft 63. Fifty-six is the eccentric shaft of said eccentric cam 64. The slider 55 is fitted to said eccentric shaft 56.

FIGS. 6A and 6B shows the coiled spring as fitted. The coiled spring 37 is fitted to a pillar 65 and is engaged at the respective ends with the first operating lever 30 and second operating lever 33 so as to be fixed.

FIG. 7 shows the details of the attachment. Only the connection between the second operating lever 33 and its attachment shall be described. Sixty-six is a cylindrical. attachment body provided with a flange 67 at each end of the outer periphery. A cushion 68 made of such elastic bodyas a foamed polyethylene, foamed vinyl chloride or sponge rubber is wound on said cylindrical attachment body 66 so as to be in contact along the peripheral edge with said flange 67. The second operating lever 33 is inserted into the opening 44 made in the cushion 68 and attachment body 66 at the time of fitting the cushion and the second operating lever 33 and the attachment are secured with a bolt 46 and a nut 69.

The operation of the present invention shall now be explained.

When the switch 17 is switched on, a direct current rectified by the rectifier part 15 will be applied to the electric motor part 18, the worm 58 will rotate with the rotation of the motor and this rotary motion will be transmitted to the wormwheel 59 and the gears 60 and 62 so as to rotate the rotary shaft63. With the rotation of the rotary shaft 63, the eccentric cam 64 will rotate and the eccentric shaft 56 will make a circular motion. Therefore, the slider 55 fixed to said eccentric shaft-'56 will reciprocate through the guides 53 and 54 within the opening 52 made in the first operating lever 30. Therewith, the first operating lever 30 and also the attachment 42 connected to it v through the second operating lever 33 will be oscillated in the direction indicated by the arrow Y. Further, through the gear part 41 meshing with the gear part 32 of the first operating lever 30, the third operating lever 38 will be oscillated in the direction opposed to that of the second operating lever 33 and its attachment 43 will be oscillated in the direction opposed to that of the attachment 42. j

A feature of the present invention is that the third operating lever provided with the attachment is rotatably pivoted through the coiled spring to one of a pair of the operating levers oscillated in the directions opposed to each other by such mechanism as is mentioned above so that, in case an overload is applied during the oscillation of both attachments, one attachment may be flexed, therefore the overload may be 3 sharedbytheqxingpartandmtthesametimeflnthecaeot actually nursagingmmclntheoeeillatingd'stanee between theattachmentsmayvaryinrespometotheloadandtheteforeapainlesseffectivemessagemaybemade. I

Amherf l fq lllwpresentinventionisthattheelectric motor. cooling fan and rectifierare linearly arranged within thebodyeasmapniroftheoperatingleversarepivotedtothe gearboxoombinedintegrallywiththemotorpartandthese operatingleversarepmje'ctedouton'the'sideofthebodycase sothattheelectricmauagermaybeformedinaformlongin thelatenldirectionandeaytohold.

A further feature of die presentinvention is each operatingleverisimertedthroughtheopenin'ginthecylimlri- -cal attaclunentbuee'nclosed withthecushion and'iseonnectedwiththeattachnientbymeamoftheboltandnutso thatthemountingoperationotthea'ttachmentmybenade so simple that general users can easily mount. dismount and washtheattachmentpartandreplacethecushion.

- Another feature of the present invention is that, in to drive the operating lever, the squuresllder is fitted andtixed to the eccentric shall and is reciprocatedalong the "made ofplasticsandflxedtobothside edge partsol'theopening in the operating lever. so that wear and noise may be reduced even in a mnlubricated state.

A further feature of the present invention is that the gear box is integrally combined with the motor part and is set and fixed inside one half of the body case split into two halves so that the electric massager may be assembled very simply.

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